Rear Washer Input Short to Ground
The rear washer pump circuit is shorted to ground, meaning the electrical wire is touching metal and draining power instead of operating the washer. It's like a water hose with a hole in it—the water never reaches the nozzle.
The body control module monitors the voltage and current draw on the rear washer input circuit. When the circuit shorts to ground, current flow becomes excessive and voltage drops below the normal operating threshold. The ECU detects this abnormal resistance pattern and triggers the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Voltage | 12V when inactive; 10-14V during operation | Below 2V or continuous ground connection detected |
| Current Draw | 0A idle; 3-8A during pump activation | Excessive current draw indicating short to ground |
Code B2115 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2115 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.